Description

Description

The purpose of the air distribution system is to route air to the designated registers. This is accomplished when air enters the plenum through the fresh/recirculated air inlet and is routed to the desired outlets by the use of air distribution doors.

The air distribution system contains the heater core, A/C evaporator core, blower motor, and all of the distribution doors. All of the air is mixed and distributed inside of the plenum assembly, depending on the distribution door positions.

Heating/Defrosting
The heater system is a blended air system, receiving outside air through the air inlet, which is connected to the upper cowl. Air is directed through and/or around the heater core and mixed and discharged through outlets in the plenum assembly to the floor, panel or defrost nozzles, as desired.

Heater Core
The heater core consists of a number of fins and tubes in an arrangement to extract heat from the engine coolant and transfer that heat to the air that passes through the heater core.

Blower motor
The blower motor pulls air from the air inlet and forces it into the plenum assembly where it is mixed and distributed. The blower motor has seven speeds and is controlled by the blower motor switch and resistor.

Air Conditioning
The R-134a air conditioning system uses a hydrofluorocarbon (HFC) non-CFC based refrigerant, R-134a requires the use of Jaguar refrigerant oil or equivalent meeting Jaguar specification. Do not use R-12 tools and equipment when repairing a R-134a system unless specified in the workshop manual. Never mix R-12 and R-134a refrigerants and oils. They are not compatible.

A/C System
The A/C system is a multi-piece, single case design, with an integral blower. The system allows the operator to control the temperature by delivering heated or cooled air to maintain a constant temperature. In addition, during A/C operation, it reduces the relative humidity of air inside the vehicle. Controls are provided to adjust the temperature and system functions, included blower motor speeds for desired airflow. Outside air is drawn from the cowl air inlet just below the windshield during all system operations except for MAX A/C cooling (when recirculated air is used) and OFF.

Control System Inputs
The climate control system inputs are selected manually from the climate control head.

Control System Outputs
The air inlet, air distribution and air temperature blend doors are all controlled by electronic stepper motors.

NOTE: All A/C related tests should be run in an ambient temperature of at least 10 °C (50 °F).

1. Verify the customer concern by operating the system.
2. Visually inspect for obvious signs of mechanical or electrical damage.

Mechanical Electrical
Refrigerant (fill level, leakage) Fuse(s)
Drive belt damaged Circuit faulty or damaged
Heater control flaps Blower motor
plug damaged or loose
A/C compressor
Cooling fan

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the concern is not visually evident, verify the symptom and refer to PDU. Testing and Inspection